RAA
getLatestCumulative(RAA)
Y <- matrix(c(1, 2, 3,
4, 5, 0,
6, NA, NA), byrow=TRUE, nrow=3)
getLatestCumulative(Y) # c(3, 0, 6)
getLatestCumulative(Y, na.values = 0) # c(3, 5, 6)
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